Shuttering for use in molding arched concrete roof structures



Nov. 4, 1952 A H w s 2,616,148

SHUTTERING FOR USE IN MOLDING ARCHED CONCRETE ROOF STRUCTURES Filed Nov. 25, 1949 4 Sheets-Sheet 1 VIII I FlGl Filed NOV. 25, 1949 4 Sheets-Sheet 2 Nov. 4, 1952 A. H. HAWES 2,616,143

SHUTTERING FOR USE IN MOLDING ARCHED CONCRETE ROOF STRUCTURES TEL INVEN NOV. 4, 1952 HAWES 2,616,148

, SHUTTERING FOR USE IN MOLDING ARCHED CONCRETE ROOF STRUCTURES Filed Nov. 25, 1949 4 Sheets-Sheet 3 SHUTTERING FOR USE IN MOLDING ARCHED Nov. 4, 1952 A H HAWES 2,616,148

I CONCRETE ROOF STRUCTURES Filed Nov. 25, 1949 4 Sheets-Sheet 4 I f 19 :5 i I 7 O 34 FK-IUZ 39' o i F \4 as 0 o as @U: P

lNVENTOR Patented Nov. 4, 1952 SHUTTERING FOR USE IN MOLDING ARCHED CONCRETE ROOF STRUC- TUBES Albert Henry Hawes, Erdington, Birmingham,

England, assignor to Kwikform Limited, Birmingham, England, a British company Application November 25, 1949, Serial No. 129,301 In Great Britain January 11, 1949 2 Claims.

This invention relates to shuttering for use in forming structures of concrete and other material which is cast in situ and allowed to harden and is concerned with shuttering for use in forming arched roofs and other curved structures, for example, circular cooling towers of electric power stations.

The invention has for its object the provision of an improved form of shuttering which will enable surfaces of generally curved form to be cast to the particular curvature desired.

According to the present invention I provide shuttering plates formed from flexible metal sheets provided with reinforcing members in which one edge of each plate is provided with a lip adapted to be received in a, recessed edge on an adjacent plate, the reinforcing members adjacent the lipped edges of their associated plates being clamped to a supporting scalfolding structure in such a manner as to secure the adjacent recessed edge plate to such structure by the same clamps so that an economy in the number of clamps required is effected.

Referring to the drawings:

Figure 1 is aside elevation of a shuttering structure for forming an arched roof embodying shuttering plates in accordance with the present invention.

Figure 2 is a sectional side elevation to an enlarged scale of the upper part of the structure depicted in Figure 1.

Figure 3 is a sectional view on the line 3-3 of Figure 2.

Figure 4 is a perspective view of one of the shuttering plates embodying the present invention.

Figure 5 is a sectional view to an enlarged scale of the meeting edge portions of one pair of contiguous shuttering plates which are depicted in Figure 2.

Figure 6 is a part-sectional plan view of a shuttering structure embodying shuttering plates in accordance with the present invention for use in forming a circular Wall of a tower.

Figure 7 is a sectional view on the line 1-1 of Figure 6.

Referring firstly to Figures 1 to 5 of the drawings, shuttering in accordance with the present invention comprises a plurality of identical shuttering plates indicated at H) in Figure 4, each shuttering plate consisting of a resilient flexible relatively thin rectangular metal sheet I I formed preferably of aluminium or an aluminium alloy, the sheets being reinforced at intervals along one face l2 thereof, namely, the face opposite to the face l3 which is to be presented to the material which is being cast with a plurality of spaced parallel reinforcing members l4.

Each of these reinforcing members conveniently comprises metal bars of angle section, one of the flanges l5 of each of which is secured rigidly as by welding to the face I3 of the flexible sheet so that the other flange l6 of each bar projects at right angles to the plane of the adjacent part of such face.

The sheets are adapted to be bent to the desired curved configuration in a direction extending at right angles to the length of the reinforcing members l4, that is to say, the latter extend at right angles to the direction of bending.

- The flange l6 of at least one of the reinforcing members of each shuttering plate It is adapted to be secured detachably to a supporting scaffolding structure, and in order to enable one such reinforcing member only of each shuttering plate to be so secured, with consequent reduction in the amount of securing means provided, each of the reinforcing members [4 extends parallel to one pair of opposite edges of the rectangular sheet Ii, and one of these edges is extended beyond the adjacent reinforcing member to forma lip H at one edge of the plate, while at the opposite edge of the plate the flange [5 of the reinforcing member p-rojects beyond the edge of the sheet ll to form a recess I8 which is adapted to receive the lip I! of the next adjacent plate.

The reinforcing member 14 beyond which the lip l'l projects is, in such an arrangement, the only reinforcing member which is required to be secured to the supporting structure, and forthis purpose the flange I6 of such member is formed at each end thereof with a hole l9, asshown in Figure 3, to receive detachably the hooked ends 20 of a pair of spaced parallel wires 2|, which wires form part of a U-shaped clamp shown most clearly in Figure 3, the wires being connected by a bridge piece 22, in a threaded hole of which works a clamping screw 23 carrying a pressure plate 24 adapted to engage with the edge of the web 25 of one of a number of supporting ribs 26 which are provided for supporting the shuttering plates, the ribs being disposed in spaced parallel relationship at right angles tothe length of the reinforcing members l4 and being of curved configuration to correspond to the curvature of the arched roof which is to be formed.

Each rib is made in a, number of sections 21, each of T form in cross section and connected together detachably by fish plates 23, the centres of the ribs 26 being spaced apart by a distance corresponding to the overall dimension of the shuttering plates in a direction along the length of the members [4, so that the two ends of each of the reinforcing members rest on the head 29 of each T section rib.

The reinforcing member [40f each shuttering plate whichiis, adj acent the lip L1 is thus clamped at each end to the ribs 26 in the manner described with the shuttering plates disposed with the edges of their sheets H in abutment with one another, and with the hp [.1 .of each plate engaging within the recess 18 of the adjacent edge of the contiguous plate so as to apply the clamping pressure to the base of such recess 18 which is formed by the adjacent flange I 5, and secure the edge portion of the associated plate in the desired position with the reinforcing member adjacent such recess in tight engagement with the head 29 of each adjacent pair of ribs '26.

Thus the shuttering plates are secured with the flanges N of each reinforcing member in engagement with the head 29 .of each rib with the shuttering plates .curved to 'theconfiguration tor the curved ribs 126 corresponding to the desired curvature of the roof to be formed.

The ribs :26 are supported at intervals upon purlins :30 extending .at right angles to the length of the ribs, to which purli-ns they are connected by clamps 3-1, the purlins being supported from the ground through the medium of struts .32 as shown in Figure l.

Adjacent the flanges .15 .of each reinforcing member the flexible sheets U will necessarily'be straight, and in order to permit of the abutting .edges of the sheets along each hp 1.1 being disposed at -a slight angle to .one :another so that the sheets -l-l .collectively present .a surface which is curved .as. :far ,as ,possible over its entire .area, the fflange 15 of the reinforcing member ,adja- .cent each recess L8 is bent .in .a direction-away from such recess wher it projects bey n the.

.edge of the associated sheet as indicated at $33 i -fi ured.

The :ilanges 2-] 6 of the reinforcin members .are provided with additional holes 34 to receive the @arms of; additional U'eshaped clamps if desired.

circular wall, for example, ,the wall of a cooling tower .as used in an electric power station, for

which purpose it is necessary to provide instead of .a'single set off shuttering plates for forming one face of the/structure as in the arrangement already described, two sets of shuttering plates.

each for forming On of the two faces 'of the wall, one 'set of shuttering plates "being curved I to .convex con guration as in the arrangement already described, and as "indicated generally at 35 in Figure for forming the inner face of thewall', and the "other *set'being formed to concave configuration as; indicated generally at 36 "to form the outer face of the wall.

The-two sets'o'f shuttering plates are supported from arched ribs 31 and 38 of convex and concave form respectively to which they are secured inm'anner similar to the preceding arrangement, the individual shuttering plates having a configuration identical with that shown in Figure *4.

As inthe arrangement shown in Figure 6 and 7, the shuttering plates are not being supported from beneath. The convex curved plates 35 are clamped to the ribs 31 at the four corners of each plate so that twice as many U-shaped clamps are used, than is the case with the preced- "ins arrangement for each plate, while in the case of the concave shuttering plates 36, in order to secure the plates in the desired concave configuration intermediate their extremities, the U- shaped clamps are connected to the reinforcing members Ill which are nearest to the centre of each plate, and it is found that by providing the lip I! along one edge of each plate engaging in the recess 1'8, at the adjacent edge of the contiguous plate, the clamping of the reinforcing members l4 adjacent such lip and recess is unnecessary.

The concave plates 36 are preferably clamped cen rally of their length as well as at each end thereof as indicated in, Figure '7.

Spacing members, which do not form anypart "of the present invention, are provided at intervals as indicated at 39 for maintaining 'the .OP-

jposed faces of the two sets of shuttering plates spaced by the requisite distance apart.

The sets of ribs 131 and 38 are clamped at intervals to vertically extending supporting tubes 40.

The shuttering plates described can be bent to varying curvatures corresponding to the particular curvature of the structure to be formed so that the same plates can 'be used repeatedly for forming structures of diiferent curvature, .or if desired, for forming structures of plane form, and the fact that the plates are resilient ensures that they resume flat confi uration when released f er use.

What I claim then is:

1. sh tter ng f r t e p rpose described compri i a plurality of suppor in memb rs. of similar curved configuration, means supporting said members in, spaced parallel relationship with their respective axes of curvature aligned, a plurality of flexible sheet metal shuttering platesarranged. in parallel rows, reinforcing members ex-- tending longitudinally of the rows alongone pair of opposite edges of each plate, .said plates being secured to said reinforcing members, .said reinforcing members extending transversely of said supporting members with the ends of adjacent reinforcing members of contiguous plates in a ,row abutting on a common supporting member, one of said opposite edges of each plate projecting beyond the .adj acent reinforcing member .and constituting a lip extending along each .ofsaid plate edges, the reinforcing member adjacent the other of said opposite edgesof .each plate projecting beyond the adjacent plate edge to form in vco-operation therewith a recess extending along each of such plate edges, each lip on one row ofplates entering the recess at the edge of the adjacent .row of plates, and asingle clamping member securing the twoicontiguous ends of two aligned reinforcing members adjacent the lipped edge of eachrplatev to the supporting member with which said reinforcing members :abut.

2. shuttering for the purpose described comprising :a plurality of supporting members of similar "curved configuration, means supporting said members inrspaced parallel relationship with their respective :axes :of curvature aligned, =a plurality of flexible-sheet .metal shuttering plates arranged in parallel rows, reinforcing members extending longitudinally of the rows 'alongone :pair of opposite .edges of "each plate, said plates being secured to said reinforcing members, said reinforcing members extending transversely of said supporting members with the ends of adjacent reinforcing members of contiguous plates in a row abutting on a common supporting member, one of said opposite edges of each plate projecting beyond the adjacent reinforcing member and constituting a lip extending along each of said plate edges, the reinforcing member adjacent the other of said opposite edges of each plate projecting beyond the adjacent plate edge to form in co-operation therewith a recess extending along each of such plate edges, each lip on one row of plates entering the recess at the edge of the adjacent row of plates, each of said reinforcing members along the lipped edge of each plate having a hole at each end of said reinforcing member, a substantially U-shaped clamping member comprising a pair of arms joined together by a connecting part, the extremities of the arms of which clamping member engage one with each hole in the two contiguous ends of a pair of aligned reinforcing members, and clamping means on said connecting part engaging releasably with said reinforcing member on the face thereof which ismost remote from said plates to secure each of the adjacent plates thereto.

ALBERT HENRY HAWES.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,287,573 Davidson Dec. 10, 1918 1,549,950 Abbott Aug. 18, 1925 1,782,921 Gremel Nov. 25, 1930 2,017,553 Troiel Oct. 15, 1935 2,396,174 Hawes Mar. 5, 1946 FOREIGN PATENTS Number Country Date 489,886 Great Britain Aug. 5, 1938 

